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For pitching moment coefficient diagram shown below which one will have positive trim AOA?

For pitching moment coefficient diagram shown below which one will have positive trim AOA? Correct Answer Aircraft 1

Pitching moment coefficient curve is shown for 3 different configurations. To trim at positive AOA, value of zero lift pitching moment coefficient Cm0 should be positive. As can be seen in the diagram aircraft 1 has positive value of Cm0. Hence, aircraft 1 will result in trim at positive AOA.

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